Lemmy Server Performance

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lemmy_server uses the Diesel ORM that automatically generates SQL statements. There are serious performance problems in June and July 2023 preventing Lemmy from scaling. Topics include caching, PostgreSQL extensions for troubleshooting, Client/Server Code/SQL Data/server operator apps/sever operator API (performance and storage monitoring), etc.

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De-facto memory leak (lemmy.world)

submitted 1 year ago by DreadTowel@lemmy.world to c/lemmyperformance@lemmy.ml

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It looks like the lack of persistent storage for the federated activity queue is leading to instances running out of memory in a matter of hours. See my comment for more details.

Furthermore, this leads to data loss, since there is no other consistency mechanism. I think it might be a high priority issue, taking into account the current momentum behind growth of Lemmy...

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[–] King@vlemmy.net 1 points 1 year ago (2 children)

Can you provide a link? Only thing I see on Couchbase is for NoSQL databases.

[–] Gashole711@lemmy.world 1 points 1 year ago (2 children)

It is a NoSQL database but the SQL syntax is ANSI SQL compliant. If you moved the queues to Couchbase and let it handle the replication and consistency, you wouldn't have to code for it.

[–] King@vlemmy.net 1 points 1 year ago (1 children)

Thanks for checking.
We don't need full database replication. We are just replicating activities that other servers are subscribed to. So the Comments table, only some of the rows will be "replicated". Not sure if/how CouchBase handles this.

[–] Gashole711@lemmy.world 1 points 1 year ago

Buckets are like databases in traditional relational databases. Here's the doc on how to filter which documents get replicated.

https://docs.couchdb.org/en/stable/replication/intro.html#controlling-which-documents-to-replicate

[–] Gashole711@lemmy.world 1 points 1 year ago

Sorry. I didn't realize XDCR was not available in the community edition.

[–] Gashole711@lemmy.world 1 points 1 year ago

Actually XDCR is not available in the community edition so that option is gone. Sorry about that.